The machine is wired in temporary rats nest format thus the scramble to shut it down is distracting. Because of the racking of the gantry, it's not something to replicate and document.
Mach may be running as though nothing went wrong. I am confident this is the case, but I will make better note if it occurs again.
There are three power downs
1) Power to the driver which is the first to hit.
2) Mach
3) The power to the BOB
Mach may be running okay and has no effect during a screen e-stop.
When the power is restored to the drivers, the crash heats up again with Mach in Reset/E-Stop
A power down of the BOB releases control and the drivers can be re-powered and Mach is good to go.
It is to hard to hear over the other equipment, however, nothing seems off with the steppers. Remember Y is at rest when this occurs. It seems that A gets a go signal and because of racking it is not so far not possible to determine if Y is running also. The last crash was in the opposite direction of the others.
There are indicator lights on the BOB. I do not speak their language, however, there are 4 red lights that seem to indicate a direction . . . perhaps they are modal. Thus when Y is in motion only on of the two axis, Y/A, lights is on. One light for this direction and the other light for that direction . . . never both. After/during the crash both A and Y are on.